IIT JAM Exam  >  IIT JAM Questions  >  At 298 k 0.1 mol of ammonium acetate and 0.14... Start Learning for Free
At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2?
Most Upvoted Answer
At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are d...
Solution:
The given problem is a typical example of a weak acid-strong base buffer solution. The buffer solution is a solution that resists the change in pH when an acid or a base is added to it. The buffer solution is a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid. In this problem, the weak acid is acetic acid and its conjugate base is acetate ion.

Step 1: Write the balanced chemical equation for the dissociation of ammonium acetate and acetic acid.

NH4C2H3O2 ⇌ NH4+ + C2H3O2-
CH3COOH ⇌ CH3COO- + H+

Step 2: Calculate the initial concentration of acetic acid and acetate ion.

Initial concentration of acetic acid (CH3COOH) = 0.14 mol/L
Initial concentration of acetate ion (C2H3O2-) = 0 mol/L

Step 3: Calculate the concentration of ammonium ion and acetate ion after the dissociation of ammonium acetate.

NH4C2H3O2 ⇌ NH4+ + C2H3O2-
Initial concentration = 0.1 mol/L 0 0
Change -x +x +x
Equilibrium concentration 0.1-x x x

Step 4: Write the equilibrium constant (Ka) expression for the dissociation of acetic acid.

Ka = [CH3COO-][H+]/[CH3COOH]

Step 5: Substitute the equilibrium concentrations of acetic acid, acetate ion, and hydrogen ion into the Ka expression.

Ka = (x)(x)/(0.14-x)

Step 6: Solve for x using the quadratic formula.

Ka = 1.8 × 10^-5
x = 7.5 × 10^-4 mol/L

Step 7: Calculate the pH of the buffer solution.

pH = pKa + log([base]/[acid])
pH = 4.76 + log(0.75/0.05)
pH = 4.9

Therefore, the pH of the resulting solution is option A, 4.9.
Explore Courses for IIT JAM exam
At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2?
Question Description
At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2? for IIT JAM 2024 is part of IIT JAM preparation. The Question and answers have been prepared according to the IIT JAM exam syllabus. Information about At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2? covers all topics & solutions for IIT JAM 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2?.
Solutions for At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2? in English & in Hindi are available as part of our courses for IIT JAM. Download more important topics, notes, lectures and mock test series for IIT JAM Exam by signing up for free.
Here you can find the meaning of At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2? defined & explained in the simplest way possible. Besides giving the explanation of At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2?, a detailed solution for At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2? has been provided alongside types of At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2? theory, EduRev gives you an ample number of questions to practice At 298 k 0.1 mol of ammonium acetate and 0.14 mol of acetic acid are dissolved in 1 L of water.the ph of resulting solution is ? A 4.9 B 4.6 C 4.3 D 4.2? tests, examples and also practice IIT JAM tests.
Explore Courses for IIT JAM exam
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
10M+ students study on EduRev